Measurements of stratospheric chlorine nitrate confirmed the Rowland–Molina hypothesis about this molecule, which is recorded by the Aura spacecraft using the OMI. Along with an annual trend, the quasi-biennial oscillation of this molecule shows that its concentration (-5[1])fluctuates every 26 months. This molecule has an absorption peak at 603 nanometers known as the Chappuis band. Under negative 78 Celsius, polar stratospheric clouds can form with nitric acid, which (*) destroys this molecule. Photolysis of a certain gas leads to the generation of this molecule in the Chapman cycle. Susan Solomon described a feature named for this molecule about 15 to 30 kilometers above Antarctica, which is on track to be healed by about 2050 due to a ban on CFCs. For 10 points, identify this molecule which forms a namesake layer that absorbs UV radiation. ■END■ (10[1])